JPS6057170B2 - Patshua type gas shield disconnector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a buffered gas tank, in particular a
This invention relates to an electric field relaxation device between sharp poles consisting of point lines and cross sections.

FIG. 1 shows a conventional buffer-type gas tank that takes into account one-point/one-phase electric field relaxation, a contact part in a firmly open state, and a part of a ground tank filled with arc-extinguishing insulating gas.

In Fig. 1, 1 is a grounded tank filled with arc-extinguishing insulating gas and is a pressure vessel that accommodates the head and cutout, 2 is a fixed contact, 3 is a fixed shield on the stator side, and 4 is a movable Contactor 5 is an insulated nozzle for spraying compressed gas to ensure good current flow and breakage, 6 and 7 are buffer cylinders and pistons that compress the gas when the current is cut off, and 8 supports and fixes the piston 7. It's a bracket.

9 is a movable side shield that is conductively connected to the movable contactor 4 or the buffer cylinder 6; 10 is a connection plate that is conductively fixed to the buffer cylinder 6 in order to fix the insulating nozzle 5; 1;
1 is a bolt for fixing the movable shield 9 to the contact plate 10 and the buffer cylinder 6.

A bushing conductor (not shown) is connected to the fixed contact 2 side, and a bushing conductor (not shown) is connected to the movable contact 4 side.

In such a structure, if one terminal is assumed to have a ground failure, an electric field analysis between the contacts is performed, and the equipotential lines are shown as dotted lines, as shown in FIG. 1, for example.

In FIG. 1, the stator side is in a grounded state, and the mover side is in a high current state, and the electrolysis at point A shown in the figure is strong. Even if the length of the full stroke of the mover is increased, the electric field at point A is only slightly alleviated. For this reason, it is necessary to take measures to alleviate the electric field, especially for single-point high-voltage circuit breakers. An object of the present invention is to solve the problems of the prior art described above, and to reduce the electric field strength near the tip of the movable contact without generating an arc between the fixed side shield and the movable side shield. We provide a buffer type gas disconnector that can be used.
In order to achieve this object, the present invention movably connects the movable side shield to the buffer cylinder of the shear section, and urges the movable side shield in the direction of separation from the stationary side shield by an elastic member. ``A gap is always maintained between both shields in the moving direction of the movable side member, and during the cutting or cutting operation, the movable side shield is moved against the elastic force of the elastic member by the piston or bracket part of the shear section. It is characterized in that the movable contactor is moved to the vicinity of the tip.

An embodiment of the present invention will be described below with reference to FIGS. 2 to 4.

In these figures, the same reference numerals as in FIG. 1 indicate the same or equivalent parts. As shown in FIGS. 2 and 3, holes with diameters Dl and D2 are provided through the connection plate 10 and the buffer cylinder 6.

One of the rods 13. One has a T-shape, and the other has a diameter reduced to a certain length from the tip and is threaded. After inserting the compression spring 14 into this rod 13, it is passed through the through hole of the connection plate 10 and the buffer cylinder 6 described above, and is welded to the movable side shield 12 in advance. The threaded portion of the rod 13 is inserted into the hole of the metal fitting 15 that is electrically connected and fixed with a lock nut 16. In such a mechanical part, as shown in FIG. 2, when the breaker is closed, the rod 13 protrudes into the buffer cylinder by a length L1 by the force of the compression spring 14, and this causes the fixed side to A gap 1 is maintained between the shield 3 and the movable shield 12. Therefore, no current path is formed between these two shields, and no arc occurs here. Therefore, there is no risk that the shield will be damaged or become inoperable. Next, in the case of a circuit-opening operation, when the movable side portion including the buffer cylinder 6 connected to the operating rod (not shown) moves to the right, the rod 13 hits the piston 7 at a position moved by the length L2. It protrudes to the left at the same speed as the movable side, but opposite to the movement of the movable side.

When the rod 13 moves to the full stroke,
teeth! It will protrude only to the left. At this time, compression spring 1
4 bends and contracts. Analyzing the electric field between the contacts at this time, if the stator side is grounded and the mover side is set to high voltage as in the case of Fig. 1, the equipotential lines will become as shown in the dotted lines shown in Fig. 4. The electric field concentration at the tip of the movable contactor 4 is significantly relaxed, and disturbances in the electric field distribution can be prevented.

According to this embodiment, the structure is simple, and the movable shield 12 reliably protrudes when the shearing operation is performed, so that the electric field strength at the shearing portion is balanced, and the maximum electric field strength at the tip of the electrode can be lowered. This improves the dielectric strength between the electrodes.

FIG. 5 shows another embodiment of the invention.

A support metal fitting 15 is conductively connected to the fixed bracket 8, and a support rod 17 is fixed thereto with a nut 16.

This support rod 17 is arranged on the outer periphery of the buffer cylinder 6. After fixing the support fitting 18 to the connection plate 10 and inserting the compression spring 14 into the rod 19, the rod 19 is passed through a hole provided in a part of the support fitting 18, and the movable shield 20 is attached.
is attached to the tip of the rod 19 by making a conductive connection. In other words,
In this embodiment, the operation is performed outside the buffer cylinder 6, and there is no need to make a hole in the buffer cylinder 6. Therefore, there is no possibility that the gas inside the buffer cylinder 6 will leak, and it can be easily replaced with the conventional type. This has the effect of being able to upgrade the voltage.

It should be noted that although the description has been made regarding a single-phase, single-point disconnector or disconnector, it goes without saying that it is also effective when applied to multiple disconnectors or disconnectors.

As explained above, according to the present invention, the movable side shield protrudes to a position near the tip of the movable contact by the piston or the bracket portion against the elastic force of the elastic body as the shearing operation occurs. Therefore, it is easy to balance the electric field strength at the shrunk portion, and the maximum electric field strength at the tip of the electrode can be lowered, so that the dielectric strength between the electrodes can be improved.

In addition, in the closed circuit state, as the buffer cylinder moves, the movable side shield is moved in the direction of opening from the stationary side shield by the elastic force of the elastic body, and a distance is always maintained between it and the stationary side shield. Therefore, no current path is formed between these shields, and no arc is generated between these shields. Therefore, the harmful effects caused by this arc can be prevented.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the contact portion in an open state and potential distribution in a conventional buffer type gas shield disconnector, and Fig. 2 is a closed circuit diagram in a buffer type gas shield disconnector according to an embodiment of the present invention. Fig. 3 is an enlarged sectional view of the main part showing the state of the movable shield mounting device, and Fig. 4 shows the open circuit state of the buffer type gas shield and disconnector shown in Fig. 2. FIG. 5 is a cross-sectional view showing the contact portion in an open state in a buffer type gas shield and disconnector according to another embodiment of the present invention. 1... Ground tank, 2... Fixed contact, 3... Fixed side shield, 4... Movable contact, 5... Insulating nozzle, 6...Buffer cylinder, 7...Buffer piston, 12,2
0...Movable side shield, 13, 19...
・Rod, 14... Compression spring.

Claims (1)

[Claims] 1. A grounded tank is housed with a shingle section and filled with arc-extinguishing insulating gas, and the shingle section has a pair of fixed contacts and a movable contact that can be connected to and separated from each other during closing and cutting operations. , a puffer cylinder that compresses an arc-extinguishing insulating gas when the current is interrupted, a piston fixed to the bracket, and an arc-extinguishing insulation compressed between the fixed contact and the movable contact during the extinguishing operation. A puffer type comprising an insulated nozzle that sprays gas, a fixed side shield that is conductively connected to the fixed contact, and a movable side shield that is conductively connected to the movable contact and maintains a gap between the fixed side shield and the fixed side shield. In the gas tank disconnector, the movable shield is connected to the puffer cylinder so as to be movable in the direction of movement thereof, and the movable shield is fixed to the puffer cylinder by an elastic member disposed between the puffer cylinder and the piston or bracket. The movable side shield is biased in the direction of opening from the side shield to maintain a gap between the two shields at all times, and when the movable side shield is pressed or disconnected, the movable side shield is applied to the elastic force of the elastic member by the piston or bracket portion. A puffer-type gas shield and disconnector characterized in that the movable contact is moved to the vicinity of the tip of the movable contact.